I've just upgraded from the Uno to the Due yesterday and have ran into a few problems. I've been using an FFT library in a project I've been working on and jumped to the Due for more storage and speed. What slipped my mind is although my code transferred fine, the library was mostly written for AVR, making it useless on this ARM chip. Now I'm on the hunt for a new library. I found the following site which has exactly what I need written for the Cortex M3 chips:http://www.embeddedsignals.com/ARM.htm Namely FFTCM3.sThe problem is I have no idea how to interface with a .s file. Before I was using a .h , and if I try including the .s in my sketch and try to use any functions the terminal lights up in errors. Am I using the right approach on this, is this file usable for me? Any help is greatly appreciated, if you couldn't already tell, I'm new at this

Thanks for the reply. Ya, I found a couple of different libraries in the meantime, but like you said, 90% of them use AVR assembly for speed. I did however run into this:http://arduino.cc/forum/index.php/topic,140107.0.htmlApparently we have access to an almost complete CMSIS/DSP_Lib, you just have to follow the instructions above to be able to access it. For what I need to do it's working pretty well, but definitely check that library out, it's got a ton of useful functions in it.